<?php

/*
 * This file is part of the Symfony package.
 *
 * (c) Fabien Potencier <fabien@symfony.com>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Symfony\Polyfill\Php83;

/**
 * @author Ion Bazan <ion.bazan@gmail.com>
 * @author Pierre Ambroise <pierre27.ambroise@gmail.com>
 *
 * @internal
 */
final class Php83
{
    private const JSON_MAX_DEPTH = 0x7FFFFFFF; // see https://www.php.net/manual/en/function.json-decode.php

    public static function json_validate(string $json, int $depth = 512, int $flags = 0): bool
    {
        if (0 !== $flags && \defined('JSON_INVALID_UTF8_IGNORE') && \JSON_INVALID_UTF8_IGNORE !== $flags) {
            throw new \ValueError('json_validate(): Argument #3 ($flags) must be a valid flag (allowed flags: JSON_INVALID_UTF8_IGNORE)');
        }

        if ($depth <= 0) {
            throw new \ValueError('json_validate(): Argument #2 ($depth) must be greater than 0');
        }

        if ($depth > self::JSON_MAX_DEPTH) {
            throw new \ValueError(\sprintf('json_validate(): Argument #2 ($depth) must be less than %d', self::JSON_MAX_DEPTH));
        }

        json_decode($json, true, $depth, $flags);

        return \JSON_ERROR_NONE === json_last_error();
    }

    /** @return string|false */
    public static function mb_str_pad(string $string, int $length, string $pad_string = ' ', int $pad_type = \STR_PAD_RIGHT, ?string $encoding = null)
    {
        if (!\in_array($pad_type, [\STR_PAD_RIGHT, \STR_PAD_LEFT, \STR_PAD_BOTH], true)) {
            throw new \ValueError('mb_str_pad(): Argument #4 ($pad_type) must be STR_PAD_LEFT, STR_PAD_RIGHT, or STR_PAD_BOTH');
        }

        if (null === $encoding) {
            $encoding = mb_internal_encoding();
        }

        $errorToTrigger = null;
        try {
            if (!@mb_check_encoding('', $encoding)) {
                $errorToTrigger = \sprintf('mb_str_pad(): Argument #5 ($encoding) must be a valid encoding, "%s" given', $encoding);
            }
        } catch (\ValueError $e) {
            $errorToTrigger = \sprintf('mb_str_pad(): Argument #5 ($encoding) must be a valid encoding, "%s" given', $encoding);
        }

        if (null === $errorToTrigger && mb_strlen($pad_string, $encoding) <= 0) {
            $errorToTrigger = 'mb_str_pad(): Argument #3 ($pad_string) must be a non-empty string';
        }

        if (null !== $errorToTrigger) {
            if (80000 > \PHP_VERSION_ID) {
                trigger_error($errorToTrigger, \E_USER_WARNING);

                return false;
            }

            throw new \ValueError($errorToTrigger);
        }

        $paddingRequired = $length - mb_strlen($string, $encoding);

        if ($paddingRequired < 1) {
            return $string;
        }

        switch ($pad_type) {
            case \STR_PAD_LEFT:
                return mb_substr(str_repeat($pad_string, $paddingRequired), 0, $paddingRequired, $encoding).$string;
            case \STR_PAD_RIGHT:
                return $string.mb_substr(str_repeat($pad_string, $paddingRequired), 0, $paddingRequired, $encoding);
            default:
                $leftPaddingLength = floor($paddingRequired / 2);
                $rightPaddingLength = $paddingRequired - $leftPaddingLength;

                return mb_substr(str_repeat($pad_string, $leftPaddingLength), 0, $leftPaddingLength, $encoding).$string.mb_substr(str_repeat($pad_string, $rightPaddingLength), 0, $rightPaddingLength, $encoding);
        }
    }

    public static function str_increment(string $string): string
    {
        if ('' === $string) {
            throw new \ValueError('str_increment(): Argument #1 ($string) cannot be empty');
        }

        if (!preg_match('/^[a-zA-Z0-9]+$/', $string)) {
            throw new \ValueError('str_increment(): Argument #1 ($string) must be composed only of alphanumeric ASCII characters');
        }

        for ($i = \strlen($string) - 1; $i >= 0; --$i) {
            $char = $string[$i];

            if ('z' === $char) {
                $string[$i] = 'a';
                continue;
            }
            if ('Z' === $char) {
                $string[$i] = 'A';
                continue;
            }
            if ('9' === $char) {
                $string[$i] = '0';
                continue;
            }

            $string[$i] = \chr(\ord($char) + 1);

            return $string;
        }

        switch ($string[0]) {
            case 'a': return 'a'.$string;
            case 'A': return 'A'.$string;
        }

        return '1'.$string;
    }

    public static function str_decrement(string $string): string
    {
        if ('' === $string) {
            throw new \ValueError('str_decrement(): Argument #1 ($string) cannot be empty');
        }

        if (!preg_match('/^[a-zA-Z0-9]+$/', $string)) {
            throw new \ValueError('str_decrement(): Argument #1 ($string) must be composed only of alphanumeric ASCII characters');
        }

        if (preg_match('/\A(?:0[aA0]?|[aA])\z/', $string)) {
            throw new \ValueError(\sprintf('str_decrement(): Argument #1 ($string) "%s" is out of decrement range', $string));
        }

        if (!\in_array(substr($string, -1), ['A', 'a', '0'], true)) {
            return implode('', \array_slice(str_split($string), 0, -1)).\chr(\ord(substr($string, -1)) - 1);
        }

        $carry = '';
        $decremented = '';

        for ($i = \strlen($string) - 1; $i >= 0; --$i) {
            $char = $string[$i];

            switch ($char) {
                case 'A':
                    if ('' !== $carry) {
                        $decremented = $carry.$decremented;
                        $carry = '';
                    }
                    $carry = 'Z';

                    break;
                case 'a':
                    if ('' !== $carry) {
                        $decremented = $carry.$decremented;
                        $carry = '';
                    }
                    $carry = 'z';

                    break;
                case '0':
                    if ('' !== $carry) {
                        $decremented = $carry.$decremented;
                        $carry = '';
                    }
                    $carry = '9';

                    break;
                case '1':
                    if ('' !== $carry) {
                        $decremented = $carry.$decremented;
                        $carry = '';
                    }

                    break;
                default:
                    if ('' !== $carry) {
                        $decremented = $carry.$decremented;
                        $carry = '';
                    }

                    if (!\in_array($char, ['A', 'a', '0'], true)) {
                        $decremented = \chr(\ord($char) - 1).$decremented;
                    }
            }
        }

        return $decremented;
    }
}
